Hawking thinks we Earthlings could all be toast by then. Hawking made a video appearance at the 2017 Tencent WE Summit in Beijing on Sunday, and warned that overcrowding and increased energy consumption could bring a fiery end to our world. The end would come in a "ball of fire," USA Today quotes Hawking as saying. https://www.cnet.com/news/stephen-hawking-earth-ball-of-fire-600-years-tencent-we-summit-beijing/